I let the 2 first games alone during several days while I was playing with an other one and it didn't make any elder of 90 y/o!! So, I decided to let all the tribes alone and to not playing VV3 at all.
To day, after 1 week without playing at all, I went back to my dear little villagers! And I found a lot of them dead but none at 90!! It's not very, very important but I feel frustrated!!